Auran Kultasepät

The last letter of their mark series' are what Auran Kultasepät called 'kretsileima'. The closest translation of this is 'filings mark', specifically the waste filings or rubbish left after making a metal object. They were originally associated with being a mark for identifying the responsibility for shoddy and bad work rather than good; an internal quality or control mark if you like. Only later were these given 'master'-mark status.